Electric lamp for radios



Jury 19,1927. 7 1,636,211

C. BRAMMING ELECTRIC LAMP FOR RADIQS mma July 3o. 1925 n n n n u M Ah by My/Mga 6 I l yfafy/ Patented July 19, 1927. i"

UNITED STATES;

. 1,636,21'21, PATENT OFFICE.`

CARL BRAMMING, OF CHICAGO, ILLINOISLASSIGNOR TO ACCESSORIES MANUFACTUR- ING COMPANY, A CORPORATION OF ILLINOIS.

ELECTRIC LAMP FOR RADIOS.

Application filed July 30, 1925. Serial No. 46,936. i

The invention relates to lamps, .andl more particularly to electric lamps, 'for radio cabinets.

One oi the objects ot the invention is the .-3 provision of new and improved lamp support that is small enough to be conveniently supported on a radiocabinet and that has means whereby the electric energy supplied for .lighting the lamp may be taken from io the battery employed in the operation of the radio mechanism.

Another object of the invention is 4the provision oi? new and improved means'for adjusting the lamp relative toits base, and to the radio cabinet on which it is supported.

A still further object of the invention is the provision of a new andiimproved lamp support that is provided with ay cheap and efficient switch mechanism, bulb holder and the like. y

Another object of the invention is the provision oitnew and improved lamp support that is Cheap to manufacture, easily assembled, readily adjusted when in use, eilicient and durable, and that is notlihely to become broken or get out of order.

Other and further objects and advantages will appear from the following description taken in connection with the accompanying drawings, in whichi Fig. 1 is a perspective View of a radio'cabinet showing my invention in position thereon;

Fig. 2 is an'elevation of the lamp,

Fig. 3 is ay view at right angles from that shown in Fig. 2, with parts in section;

Fig. 1, is a bottom plan view of the hood or shade; V j

Fig. 5 is a plan view of a portion. of the switch mechanism; and 1 j Fig. 6 is a top plan view of an insulating disk used in the construction of the switch. Y The support for the electric lamn is especially adapted for supporting .a small electric light bulb for illuminating the dial plates of a radio cabinet. The current for lighting the lamp may be, and preferably is, supplied from one of the batteries constituting the radioequipment. While the lamp is diminutive in size, and is especially designed for illuminating the dial plates of radio cabinets, it is understood that it is not limited in its use and size to this relation. For convenience in illustra-tion, however, the device is shown as being associated' with a radio devicel in which the reference numeral 10 designates a radio cabinet which may be of any approved construction. The cabinet is provided with one or more dial plates 11 and knobs .12 for `adjusting the receiving mechanism, as is usual in such constructions. The conventional amplifying horn is shown at 13.

Since the speciic construction of the radio mechanismconstitutes no part .of the present invent-ion, it is not thoughtnecessary to further illustrate or describe the same.

The readings of the dials of a radio equipment indicating the adjustments of the receiving mechanism for diierent stations having once been ascertained by eX- periment, the operator may at any time atter that tune in on an of those stations while they are broadcasting, by resetting the dials as indicated on his chart or record. It is therefore desirable that the dials ci the radio cabinet be well illuminated so that the legends or markings thereon maybe plainly visible in order to make the proper adjustments readily and easily. Radio apparatus has come to be a valuable if not a necessary part of the equipment of tourists and others traveling about the country for pleasure, and it is very desirable that a lamp be pro vided that ywill be sufiicient to illuminate the dials but which will be compact and adjustable and that may be operated from one of the batteries of the set. The principal object of the present invention is the provision of a lamp that is especially adapted for illu`- minating the dial plates of radio equipment.

In the form of the device selected to illustrate one embodiment of the invention, a

hollowV metallic base 14 is employed having i a bifurcated extension 15 in which is pivotally mounted an arm 16 which may if desired be slightly curved as shownin Fig. 3. The upper end of the arm 16 is adapted to be pivoted between the brackets 17 and 18 rigidly. secured to a hood or lamp shade 19 concave in cross-section. Y The pivot 21 at the upper end of the arm16 is tapped into plate 18 and the pivot 22 at the lower end of the arm engages a threaded openingvin one of the furcations whereby these parts may be clamped to the arm to constitute a friction hinge for holding the arm and the hood or shade in adjusted position.

The base 14 is hollow and a switch AInechmism is mounted therein. The hollow basa is provided with an annular ledge or shoulder 23 against which a circular disk 24 of insulating material is adapted to engage. The disk 24 is provided with an extension 25 which extends outwardly through a sieL 26 in the base 14 and is adapted to be employed as a thumb piece for operatingl the switch. The disk 24 is provided with two contact members 27 and 28 which extend through the said disk. A wire or conductor 29 is rigidly connected to one ot the contactmembers, as 27, and extends upwardly through the hollow arm 1G.

The base 14 is also provided with a led ne or shoulder 31 against which a disk 32 ot iusulating` material is secured. The disk is secured in position by any suitable means` as the screws 38. The disk is provided with a pair ot spring contact members 34 and 35 which are adapted to be engaged by the contact members 27 and 28 on the disk 24.

Suitable conductors 36 are rigidly connected 'to the contact members 34 and 85 and are adapted to be connected to the bindingposts ot one of the batteries. The Contact member 28 on the disk 24 is provided with an extension 37 for engaging; the shoulder 28 for grounding said contact member.

Suitable means are provided for mounting the elect-ric light bulb within the hood or shade 19. As shown, a metallic bracket 38 is employed for this purpose. The bracket 88 is provided with a circular opening 39 tor receiving the base 49 ot the bulb 41. Slots 42 are provided Ytor accommodating the retaininglugs 43. The bracket is also provided with depending lingers 44 for engaging' vthe sides ot the base ot the bulb tor holding the same in posit-ion. rlhe bracket 38 is provided with au angular biiurcated extension 45 which is adapted to be attached to an insulatiirer member 4G which is secured to the hood or shade 19. The extension 45, insulating miember 46 and brackets 17 and 18 are preferably secured together by screws 47 that are tapped into the furcations of the extension The bracket 38 is provided with recesses or sockets 48 for receivinnv the retaining lugs 43 ot the base 40. The. lugs 4? are held in the recesses 48 by a spring` contact member 49 which engages the cent 1al contact member 51 of the base 40. The spring Contact member 49 is rigidly secured to the. insulating member 46 as by means ot eyelets between the turca-tions ofthe extension 45 and out of contact therewith. Preferably a strip of insulating material is employed to prevent Contact of 'the fasten-ing' means with the hood yand short circuiting the lamp. The strip extends above theupper end et the spring 49 as shown in Fig. 3. It may be clamped imposition between the insulating member 46 and the hood 19 by the screws 47. The conductor 29 is connected to the spring contact member 49 as by means ot the rivet 52 which holds the said contact member in position. ln attachinpl the bulb 41 the same is turned so the lugs 48 will reefister with the slots 42 after which the same is forced upward against the spring 49 and turned until the lugs register with and eugage the recesses 48.

The base 49 ot the bulb is grounded on the arm 16 through the bracket 3i and the screws 47. By means of this arrangement only one conductor 29 need be employed between the Contact members 27 and 28 and the electric light bulb, the other terminals grounded on the supporting arm 16.

By means ot the adjustingl screws 2l and 22 the desired amount ot .triction may be applied to the joints so that the .parts will be retained in any adjusted position to which they may be moved. By providing' joints at both ends of the supporting arm 16 the hood and bulb may be adjusted to the desired posi-- tion to give the best results.

In tracing` the current. the same may, for convenience, be considered as entering through one of the conductor members 36, thence through the contact members 84 and 27 of the switch, then through the conductor 29, spring contactmember 49 and through thel filament. On return it passes through the base 40, bracket or plate 38. arm 16, contact members 28 and 35 and back through the other conductor 36.

The plates or members and 49 are stamped from sheet metal. thus materially reducing the cost of manufacture ot devices ot this nature. The Contact members and insulating members may be. vsecured in position by means oit eyelets which operation further cheapens the manufacturingl costs ot the device.

Since the device, when used as a radio lamp, need be only six or eight inches in height, the same may by bending the joints be doubled up to occupy a very small space for transporting the same by tourists. Furthermore, the joints will permit the support to be bent so that the lamp while being:y supported on the cabinet may be readily adjust being llfi ed to properly illuminate the dial or dials l thereon.

It is thought trom 'the foregoing taken in connection with the accompanying drawings that the' construction and operation of my device will be 'apparent to those skilled in the art, and that various changesin size, shape, proportion and details ot construction may be made without departing from the spirit and scope of the appended claims.

I claim as my invention:

1. In an electric lamp, a base, an electric switch in sai-d base for opening and closing the circuit to said lamp, a rigid arm pivoted to said base, a hood pivoted to said arm, a

lamp socket in said hood, said socket being provided with'two contact members, a conductor leading from said base through said arm to one of said contact members, a metallic connection between the other contact member' and said arm whereby the samewill constitute a return conductor from said socket to said switch.

2. In an electric lamp, a metallic base, an electric switch in said base, an arm, a friction hinge between said arm and base, a hood, a friction hinge between said arm and hood, a lamp socket, means for rigidly mounting said socket on said hood independently of said arm, and an electric bulb detachably mounted in saidsocket and carried thereby.

8. In an electric lamp, a hood curved 1n cross section, an insulating member secured to said hood, a bulb support comprising an angular plate provided at one end with an opening for receiving the base of an electric light bulb, said plate being provided with slots at opposite sides of said opening the same from said hood.

and with depressions adjacent to said slots, means for securing said plate and member to said hood, a contact element secured to said member, a strip of .insulating material extending about saidelement for insulating 4. In an electric lamp, a metallic base having' a recess therein, a switch within said base for opening and closing the circuit to said lamp, said switch comprisinga plate of insulating` material secured in said recess, spring-pressed contact members secured to said plate, conductor wires secured to said members, a rotating disk of insulating material having a pair of contact elements for engaging and disengaging said springpressed contact members, .a conductor secured to one of said elements, means for grounding said other element on said base, v

and means extending through said base for operating said switch.

In testimony whereof I aHiX my signature. Y Y

CARL BRAMMING. 

